big argument

so yesterday i got in a big argument with my sister (me and hubby are living with her and my mom while looking for a house we did have our own apartment but movied out to be able to get a house)my sister has been smarting off to me every chance she got for weeks we also have a big dog that we baby that gets into stuff when hes alone because he gets afraid that hes been abandoned he started this after we got back from our honeymoon we left him for 8 days we had been working with him but its not just us that he needs that from now he needs it from everyone going in our out that he lives with i am 12 weeks pregnant my mom told me to drop the argument with my sister because I will have misscarge over that my thing is i get stressed out over my sister constantly saying stuff about me , my hubby,and my dog i normally keep it to myself but she just wouldn't stop yesterday and i felt like i was drowning in my anger i was told i just need to bottle up my emotions intill the baby gets here or i would have a misscarge according to my mom i was wrong and selfish to let her get to me that its not just me my dog and my hubby there is a baby to whom i wasn't protecting by getting overly mad but i took her jabbing weeks and all yesterday before i broke and went off on her (can this really cause a misscarge) am really wrong for breaking